Resource allocation and processing behaviors for nr v2x sidelink communications

ABSTRACT

An apparatus of user equipment (UE) includes processing circuitry coupled to a memory, where to configure the UE for New Radio (NR) vehicle-to-everything (V2X) sidelink communication. The processing circuitry is to determine a set of candidate resources of the UE from a sidelink resource pool, the sidelink resource divided into multiple time slots, frequency channels, and frequency sub-channels. Sidelink control information (SCI) is encoded for transmission to a second UE via a physical sidelink control channel (PSCCH). The SCI indicates a plurality of transmission resources of the set of candidate resources. A transport block is mapped across the plurality of transmission resources. A physical sidelink shared channel (PSSCH) is encoded for transmission to the second UE using the plurality of transmission resources, the PSSCH encoded to include the mapped transport block.

PRIORITY CLAIM

This application claims the benefit of priority to the U.S. ProvisionalPatent Application Ser. No. 62/755,344, filed Nov. 2, 2018, and entitled“SIDELINK. RESOURCE ALLOCATION AND USER EQUIPMENT PROCESSING BEHAVIORSFOR NEW RADIO VEHICLE TO ANYTHING SIDELINK COMMUNICATION,” whichapplication is incorporated herein by reference in its entirety.

TECHNICAL FIELD

Aspects pertain to wireless communications. Some aspects relate towireless networks including 3GPP (Third Generation Partnership Project)networks, 3GPP LTE (Long Term Evolution) networks, 3GPP LTE-A (LTEAdvanced) networks, and fifth-generation (5G) networks including 5G newradio (NR) (or 5G-NR) networks, 5G-LTE networks, and 5G NR unlicensedspectrum (NR-U) networks. Other aspects are directed to systems andmethods for sidelink (SL) resource allocation and user equipment (UE)processing behaviors for New Radio (NR) vehicle-to-everything (V2X)sidelink communications.

BACKGROUND

Mobile communications have evolved significantly from early voicesystems to today's highly sophisticated integrated communicationplatform. With the increase in different types of devices communicatingwith various network devices, usage of 3GPP LTE systems has increased.The penetration of mobile devices (user equipment or UEs) in modernsociety has continued to drive demand for a wide variety of networkeddevices in a number of disparate environments. Fifth-generation (5G)wireless systems are forthcoming and are expected to enable even greaterspeed, connectivity, and usability. Next generation 5G networks (or NRnetworks) are expected to increase throughput, coverage, and robustnessand reduce latency and operational and capital expenditures. 5G-NRnetworks will continue to evolve based on 3GPP LTE-Advanced withadditional potential new radio access technologies (RATS) to enrichpeople's lives with seamless wireless connectivity solutions deliveringfast, rich content and services. As current cellular network frequencyis saturated, higher frequencies, such as millimeter wave (mmWave)frequency, can be beneficial due to their high bandwidth.

Potential LTE operation in the unlicensed spectrum includes (and is notlimited to) the LTE operation in the unlicensed spectrum via dualconnectivity (DC), or DC-based LAA, and the standalone LTE system in theunlicensed spectrum, according to which LTE-based technology solelyoperates in unlicensed spectrum without requiring an “anchor” in thelicensed spectrum, called MulteFire. MulteFire combines the performancebenefits of LTE technology with the simplicity of Wi-Fi-likedeployments.

Further enhanced operation of LTE systems in the licensed as well asunlicensed spectrum is expected in future releases and 5G systems. Suchenhanced operations can include techniques for SL resource allocationand UE processing behaviors for NR V2X sidelink communications.

BRIEF DESCRIPTION OF THE FIGURES

In the figures, which are not necessarily drawn to scale, like numeralsmay describe similar components in different views. Like numerals havingdifferent letter suffixes may represent different instances of similarcomponents. The figures illustrate generally, by way of example, but notby way of limitation, various aspects discussed in the present document.

FIG. 1A illustrates an architecture of a network, in accordance withsome aspects.

FIG. 1B and FIG. 1C illustrate a non-roaming 5G system architecture inaccordance with some aspects.

FIG. 2 illustrates physical sidelink control channel (PSCCH) andphysical sidelink shared channel (PSSCH) resource allocation options, inaccordance with some aspects.

FIG. 3A illustrates a transmission resource occupancy map, in accordancewith some aspects.

FIG. 3B illustrates decoding capability impact and UE processingbehaviors, in accordance with some aspects.

FIG. 4 illustrates a block diagram of a communication device such as anevolved Node-B (eNB), a new generation Node-B (gNB), an access point(AP), a wireless station (STA), a mobile station (MS), or a userequipment (UE), in accordance with some aspects.

DETAILED DESCRIPTION

The following description and the drawings sufficiently illustrateaspects to enable those skilled in the art to practice them. Otheraspects may incorporate structural, logical, electrical, process, andother changes. Portions and features of some aspects may be included inor substituted for, those of other aspects. Aspects set forth in theclaims encompass all available equivalents of those claims.

FIG. 1A illustrates an architecture of a network in accordance with someaspects. The network 140A is shown to include user equipment (UE) 101and UE 102. The UEs 101 and 102 are illustrated as smartphones (e.g.,handheld touchscreen mobile computing devices connectable to one or morecellular networks) but may also include any mobile or non-mobilecomputing device, such as Personal Data Assistants (PDAs), pagers,laptop computers, desktop computers, wireless handsets, drones, or anyother computing device including a wired and/or wireless communicationsinterface. The UEs 101 and 102 can be collectively referred to herein asUE 101, and UE 101 can be used to perform one or more of the techniquesdisclosed herein.

Any of the radio links described herein (e.g., as used in the network140A or any other illustrated network) may operate according to anyexemplary radio communication technology and/or standard.

LTE and LTE-Advanced are standards for wireless communications ofhigh-speed data for UE such as mobile telephones. In LTE-Advanced andvarious wireless systems, carrier aggregation is a technology accordingto which multiple carrier signals operating on different frequencies maybe used to carry communications for a single LT, thus increasing thebandwidth available to a single device. In some aspects, carrieraggregation may be used where one or more component carriers operate onunlicensed frequencies.

Aspects described herein can be used in the context of any spectrummanagement scheme including, for example, dedicated licensed spectrum,unlicensed spectrum, (licensed) shared spectrum (such as Licensed SharedAccess (LSA) in 2.3-2.4 GHz, 3.4-3.6 GHz, 3.6-3.8 GHz, and furtherfrequencies and Spectrum Access System (SAS) in 3.55-3.7 GHz and furtherfrequencies).

Aspects described herein can also be applied to different Single Carrieror OFDM flavors (CP-OFDM, SC-FDMA, SC-OFDM, filter bank-basedmulticarrier (FBMC), OFDMA, etc.) and in particular 3GPP NR (New Radio)by allocating the OFDM carrier data bit vectors to the correspondingsymbol resources.

In some aspects, any of the UEs 101 and 102 can comprise anInternet-of-Things (IoT) UE or a Cellular IoT (CIoT) UE, which cancomprise a network access layer designed for low-power IoT applicationsutilizing short-lived UE connections. In some aspects, any of the UEs101 and 102 can include a narrowband (NB) IoT UE (e.g., such as anenhanced NB-IoT (eNB-IoT) UE and Further Enhanced (FeNB-IoT) UE). An IoTUE can utilize technologies such as machine-to-machine (M2M) ormachine-type communications (MTC) for exchanging data with an MTC serveror device via a public land mobile network (PLMN), Proximity-BasedService (ProSe) or device-to-device (D2D) communication, sensornetworks, or IoT networks. The M2M or MTC exchange of data may be amachine-initiated exchange of data. An IoT network includesinterconnecting IoT UEs, which may include uniquely identifiableembedded computing devices (within the Internet infrastructure), withshort-lived connections. The IoT UEs may execute background applications(e.g., keep-alive messages, status updates, etc.) to facilitate theconnections of the IoT network.

In some aspects, any of the UEs 101 and 102 can include enhanced MTC(eMTC) UEs or further enhanced MTC (FeMTC) UEs.

The UEs 101 and 102 may be configured to connect, e.g., communicativelycouple, with a radio access network (RAN) 110. The RAN 110 may be, forexample, an Evolved Universal Mobile Telecommunications System (UMTS)Terrestrial Radio Access Network (E-UTRAN), a NextGen RAN (NG RAN), orsome other type of RAN. The UEs 101 and 102 utilize connections 103 and104, respectively, each of which comprises a physical communicationsinterface or layer (discussed in further detail below); in this example,the connections 103 and 104 are illustrated as an air interface toenable communicative coupling, and can be consistent with cellularcommunications protocols, such as a Global System for MobileCommunications (GSM) protocol, a code-division multiple access (CDMA)network protocol, a Push-to-Talk (PTT) protocol, a PTT over Cellular(POC) protocol, a Universal Mobile Telecommunications System (UMTS)protocol, a 3GPP Long Term Evolution (LTE) protocol, a fifth-generation(5G) protocol, a New Radio (NR) protocol, and the like.

In an aspect, the UEs 101 and 102 may further directly exchangecommunication data via a ProSe interface 105. The ProSe interface 105may alternatively be referred to as a sidelink interface comprising oneor more logical channels, including but not limited to a PhysicalSidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel(PSSCH), a Physical Sidelink Discovery Channel (PSDCH), and a PhysicalSidelink Broadcast Channel (PSBCH).

The UE 102 is shown to be configured to access an access point (AP) 106via connection 107. The connection 107 can comprise a local wirelessconnection, such as, for example, a connection consistent with any IEEE802.11 protocol, according to which the AP 106 can comprise a wirelessfidelity (WiFi®) router. In this example, the AP 106 is shown to beconnected to the Internet without connecting to the core network of thewireless system (described in further detail below).

The RAN 110 can include one or more access nodes that enable theconnections 103 and 104. These access nodes (ANs) can be referred to asbase stations (BSs), NodeBs, evolved NodeBs (eNBs), Next GenerationNodeBs (gNBs), RAN nodes, and the like, and can comprise ground stations(e.g., terrestrial access points) or satellite stations providingcoverage within a geographic area (e.g., a cell). In some aspects, thecommunication nodes 111 and 112 can be transmission/reception points(TRPs). In instances when the communication nodes 111 and 112 are NodeBs(e.g., eNBs or gNBs), one or more TRPs can function within thecommunication cell of the NodeBs. The RAN 110 may include one or moreRAN nodes for providing macrocells, e.g., macro RAN node 111, and one ormore RAN nodes for providing femtocells or picocells (e.g., cells havingsmaller coverage areas, smaller user capacity, or higher bandwidthcompared to macrocells), e.g., low power (LP) RAN node 112.

Any of the RAN nodes 111 and 112 can terminate the air interfaceprotocol and can be the first point of contact for the UEs 101 and 102.In some aspects, any of the RAN nodes 111 and 112 can fulfill variouslogical functions for the RAN 110 including, but not limited to, radionetwork controller (RNC) functions such as radio bearer management,uplink and downlink dynamic radio resource management and data packetscheduling, and mobility management. In an example, any of the nodes 111and/or 112 can be a new generation Node-B (gNB), an evolved node-B(eNB), or another type of RAN node.

The RAN 110 is shown to be communicatively coupled to a core network(CN) 120 via an S1 interface 113. In aspects, the CN 120 may be anevolved packet core (EPC) network, a NextGen Packet Core (NPC) network,or some other type of CN (e.g., as illustrated in reference to FIGS.1B-1I). In this aspect, the S1 interface 113 is split into two parts:the S1-U interface 114, which carries traffic data between the RAN nodes111 and 112 and the serving gateway (S-GW) 122, and the S1-mobilitymanagement entity (MMF) interface 115, which is a signaling interfacebetween the RAN nodes 111 and 112 and MMEs 121.

In this aspect, the CN 120 comprises the MMEs 121, the S-GW 122, thePacket Data Network (PDN) Gateway (P-GW) 123, and a home subscriberserver (HSS) 124. The MMEs 121 may be similar in function to the controlplane of legacy Serving General Packet Radio Service (GPRS) SupportNodes (SGSN). The MMEs 121 may manage mobility aspects in access such asgateway selection and tracking area list management. The HSS 124 maycomprise a database for network users, including subscription-relatedinformation to support the network entities' handling of communicationsessions. The CN 120 may comprise one or several HSSs 124, depending onthe number of mobile subscribers, on the capacity of the equipment, onthe organization of the network, etc. For example, the HSS 124 canprovide support for routing/roaming, authentication, authorization,naming/addressing resolution, location dependencies, etc.

The S-GW 122 may terminate the S1 interface 113 towards the RAN 110, androutes data packets between the RAN 110 and the CN 120. In addition, theS-GW 122 may be a local mobility anchor point for inter-RAN nodehandovers and also may provide an anchor for inter-3GPP mobility. Otherresponsibilities of the S-GW 122 may include a lawful intercept,charging, and some policy enforcement.

The P-GW 123 may terminate an SGi interface toward a PDN. The P-GW 123may route data packets between the EPC network 120 and external networkssuch as a network including the application server 184 (alternativelyreferred to as application function (AF)) via an Internet Protocol (IP)interface 125. The P-GW 123 can also communicate data to other externalnetworks 131A, which can include the Internet, IP multimedia subsystem(IPS) network, and other networks. Generally, the application server 184may be an element offering applications that use IP bearer resourceswith the core network (e.g., UMTS Packet Services (PS) domain, LTE PSdata services, etc.). In this aspect, the P-GW 123 is shown to becommunicatively coupled to an application server 184 via an IP interface125. The application server 184 can also be configured to support one ormore communication services (e.g., Voice-over-Internet Protocol (VoIP)sessions, PTT sessions, group communication sessions, social networkingservices, etc.) for the UEs 101 and 102 via the CN 120.

The P-GW 123 may further be a node for policy enforcement and chargingdata collection. Policy and Charging Rules Function (PCRF) 126 is thepolicy and charging control element of the CN 120. In a non-roamingscenario, in some aspects, there may be a single PCRF in the Home PublicLand Mobile Network (HPLMN) associated with a UE's Internet ProtocolConnectivity Access Network (IP-CAN) session. In a roaming scenario witha local breakout of traffic, there may be two PCRFs associated with aUE's IP-CAN session: a Home PCRF (H-PCRF) within an HPLMN and a VisitedPCRF (V-PCRF) within a Visited Public Land Mobile Network (VPLMN). ThePCRF 126 may be communicatively coupled to the application server 184via the P-GW 123.

In some aspects, the communication network 140A can be an IoT network ora 5G network, including 5G new radio network using communications in thelicensed (5G NR) and the unlicensed (5G NR-U) spectrum. One of thecurrent enablers of IoT is the narrowband-IoT (NB-IoT).

An NG system architecture can include the RAN 110 and a 5G network core(5GC) 120. The NG-RAN 110 can include a plurality of nodes, such as gNBsand NG-eNBs. The core network 120 (e.g., a 5G core network or 5GC) caninclude an access and mobility function (ANTE) and/or a user planefunction (UPF). The AMF and the UPF can be communicatively coupled tothe gNBs and the NG-eNBs via NG interfaces. More specifically, in someaspects, the gNBs and the NG-eNBs can be connected to the AMF by NG-Cinterfaces, and to the UPF by NG-U interfaces. The gNBs and the NG-eNBscan be coupled to each other via Xn interfaces.

In some aspects, the NG system architecture can use reference pointsbetween various nodes as provided by 3GPP Technical Specification (TS)23.501 (e.g., V15.4.0, 2018-12). In some aspects, each of the gNBs andthe NG-eNBs can be implemented as a base station, a mobile edge server,a small cell, a home eNB, and so forth. In some aspects, a gNB can be amaster node (MN) and NG-eNB can be a secondary node (SN) in a 5Garchitecture.

FIG. 1B illustrates a non-roaming 5G system architecture in accordancewith some aspects. Referring to FIG. 1B, there is illustrated a 5Gsystem architecture 140B in a reference point representation. Morespecifically, UE 102 can be in communication with RAN 110 as well as oneor more other 5G core (5GC) network entities. The 5G system architecture140B includes a plurality of network functions (NFs), such as access andmobility management function (ANTE) 132, session management function(SMF) 136, policy control function (PCF) 148, application function (AF)150, user plane function (UPF) 134, network slice selection function(NSSF) 142, authentication server function (AUSF) 144, and unified datamanagement (UDM)/home subscriber server (HSS) 146. The UPF 134 canprovide a connection to a data network (DN) 152, which can include, forexample, operator services, Internet access, or third-party services.The AMF 132 can be used to manage access control and mobility and canalso include network slice selection functionality. The SMF 136 can beconfigured to set up and manage various sessions according to networkpolicy. The UPF 134 can be deployed in one or more configurationsaccording to the desired service type. The PCF 148 can be configured toprovide a policy framework using network slicing, mobility management,and roaming (similar to PCRF in a 4G communication system). The UDM canbe configured to store subscriber profiles and data (similar to an HSSin a 4G communication system).

In some aspects, the 5G system architecture 140B includes an IPmultimedia subsystem (IMS) 168B as well as a plurality of IP multimediacore network subsystem entities, such as call session control functions(CSCFs). More specifically, the IMS 168B includes a CSCF, which can actas a proxy CSCF (P-CSCF) 162BE, a serving CSCF (S-CSCF) 164B, anemergency CSCF (E-CSCF) (not illustrated in FIG. 1B), or interrogatingCSCF (I-CSCF) 166B, The P-CSCF 162B can be configured to be the firstcontact point for the UE 102 within the IM subsystem (IMS) 168B. TheS-CSCF 164B can be configured to handle the session states in thenetwork, and the E-CSCF can be configured to handle certain aspects ofemergency sessions such as routing an emergency request to the correctemergency center or PSAP. The I-CSCF 166B can be configured to functionas the contact point within an operators network for all IMS connectionsdestined to a subscriber of that network operator, or a roamingsubscriber currently located within that network operator's servicearea. In some aspects, the I-CSCF 166B can be connected to another IPmultimedia network 170E, e.g. an IMS operated by a different networkoperator.

In some aspects, the UDM/HSS 146 can be coupled to an application server160E, which can include a telephony application server (TAS) or anotherapplication server (AS). The AS 160B can be coupled to the IMS 168B viathe S-CSCF 164B or the I-CSCF 166B.

A reference point representation shows that interaction can existbetween corresponding NF services. For example, FIG. 1B illustrates thefollowing reference points: N1 (between the UE 102 and the AMF 132), N2(between the RAN 110 and the AMF 132), N3 (between the RAN 110 and theUPF 134), N4 (between the SMF 136 and the UPF 134), N5 (between the PCF148 and the AF 150, not shown), N6 (between the UPF 134 and the DN 152),N7 (between the SMF 136 and the PCF 148, not shown), N8 (between the UDM146 and the AMF 132, not shown), N9 (between two UPFs 134, not shown),N10 (between the UDM 146 and the SMF 136, not shown), N11 (between theAMF 132 and the SMF 136, not shown), N12 (between the AUSF 144 and theAMF 132, not shown), N13 (between the AUSF 144 and the UDM 146, notshown), N14 (between two AMFs 132, not shown), N15 (between the PCF 148and the AMF 132 in case of a non-roaming scenario, or between the PCF148 and a visited network and AMF 132 in case of a roaming scenario, notshown), N16 (between two SMFs, not shown), and N22 (between AMF 132 andNSSF 142, not shown). Other reference point representations not shown inFIG. 1E can also be used.

FIG. 1C illustrates a 5G system architecture 140C and a service-basedrepresentation. In addition to the network entities illustrated in FIG.system architecture 140C can also include a network exposure function(NEF) 154 and a network repository function (NRF) 156. In some aspects,5G system architectures can be service-based and interaction betweennetwork functions can be represented by corresponding point-to-pointreference points Ni or as service-based interfaces.

In some aspects, as illustrated in FIG. 1C, service-basedrepresentations can be used to represent network functions within thecontrol plane that enable other authorized network functions to accesstheir services. In this regard, 5G system architecture 140C can includethe following service-based interfaces: Namf 158H (a service-basedinterface exhibited by the AMF 132), Nsmf 1581 (a service-basedinterface exhibited by the SMF 136), Nnef 158B (a service-basedinterface exhibited by the NEF 154), Npcf 158D (a service-basedinterface exhibited by the PCF 148), a Nudm 158E (a service-basedinterface exhibited by the UDM 146), Naf 158F (a service-based interfaceexhibited by the AF 150), Nnrf 158C (a service-based interface exhibitedby the NRF 156), Nnssf 158A (a service-based interface exhibited by theNSSF 142), Nausf 158G (a service-based interface exhibited by the AUSF144). Other service-based interfaces (e.g., Nudr, N5g-eir, and Nudsf)not shown in FIG. 1C can also be used.

Techniques discussed herein can be performed by a UE or a base station(e.g., any of the UEs or base stations illustrated in connection withFIG. 1A-FIG. 1C).

NR-V2X architectures may need to support high-reliability low latencysidelink communications with a variety of traffic patterns, includingperiodic and aperiodic communications with random packet arrival timeand size. Techniques disclosed herein can be used for supporting highreliability in distributed communication systems with dynamictopologies, including sidelink V2X communication systems.

Conventional LTE-V2X communication systems that define radio-layerprotocol for sidelink communication do not provide sufficient level ofreliability and do not meet latency requirements for evolved V2X usecases. Additionally, conventional LTE-V2X communication systems may beassociated with high latency, insufficient levels of reliability,sensitivity to interference, and hidden node problems.

Techniques discussed herein can be used for a sidelink resourceallocation structure that provides flexibility to support periodic andaperiodic traffic with random packet arrival time and packet size whileensuring high reliability and low latency communication. Techniquesdiscussed herein can be used for sidelink resource allocation schemesbased on intelligent sensing and resource selection procedures, as wellas intelligent UE processing behaviors for PSCCH and PSSCHdemodulation/decoding.

Sidelink Resource Structure.

A sidelink resource pool may be divided into multiple time slots,frequency channels, and frequency sub-channels. In some embodiments, UEsmay be synchronized and perform sidelink transmissions aligned with slotboundaries. A UE may be expected to select several slots andsub-channels for transmission of the transport block. In some aspects, aUE may use different sub-channels for transmission of the transportblock across multiple slots within its own resource selection window,which may be determined using packet delay budget information. In oneembodiment, a UE can use discontinuous transmission in time (total TXduration for one transport block (TB) is N slots, e.g., N=1, 2, 3, 4, .. . ) with channel access granularity equal to one slot, where channelaccess boundaries may be aligned from system perspective at slot level.

FIG. 2 illustrates PSCCH and PSSCH resource allocation options, inaccordance with some aspects. Referring to FIG. 2, diagram 202illustrates frequency-division multiplexing (FDM) resource allocation ofsidelink control or shared channel information, and diagram 204illustrates time-division multiplexing (TDM) resource allocation ofsidelink control or shared channel information. As illustrated in FIG.2, each sidelink transmission includes sidelink shared channel (PSSCH)and sidelink control channel (PSCCH) transmissions. Each PSCCHtransmission includes information about all other PSSCH resources usedfor transmission of the same transport block(s), as illustrated indiagrams 202 and 204 in FIG. 2.

UE Autonomous Resource Allocation Schemes.

Large Scale (Long-Term) Sensing.

In some aspects, the LTE-V2X sidelink sensing and resource selectionprocedure can be considered as an example of a large scale sensingprocedure. The main motivation behind large scale sensing procedure maybe to avoid transmissions on resources reserved by other UEs forperiodical transmissions. In order to accomplish this task, a UE mayprocess sidelink control channels and may perform measurements in asensing window (allocated in the past) to determine a set of candidateresources within a resource selection window (allocated in a near-futurewithin a latency budget). There may be N number of selected transmissionresources (e.g., slots, channels, and/or sub-channels), where N is aninteger greater than or equal 2 and less than 264. In some aspects, alarge scale sensing procedure may provide optimal performance forperiodic traffic, however it may not be optimized for aperiodic traffic.In addition, the following additional enhancements can be used as theymay be beneficial even to support enhanced V2X (eV2X) periodic traffic:

(a) Reduced probability of collisions (or collision handling procedures)in case of simultaneous resource (re)-selection by different UEs;

(b) Reduced and configurable sensing window (e.g., based on maximumreservation interval in the system or even lower);

(c) Configurable resource selection window duration (e.g., derived basedon packet delay budget);

(d) Refinement of candidate resource set(s) based on recently announcedtransmissions, if those collide with selected transmission resources;

(e) Prioritized selection of the first in time candidate resources,especially for initial transmission of TBs;

(f) Enhanced physical structure and multiplexing options for PSCCH andPSSCH;

(g) Enhanced resource (re)-selection conditions and triggers; and

(h) Priority handling enhancements.

In addition to large scale sensing, the following small scale sensingtechniques may be used for support of aperiodic traffic.

Small Scale (Short Term) Sensing.

The small scale sensing may be beneficial for multiple reasons. Forexample, it can serve as a complementary procedure to supplement thelarge scale sensing procedure discussed above, to address the potentialissue of collisions in case of simultaneous resource (re-)selection.Additionally, the small scale sensing may be beneficial for aperiodictraffic handling, where large scale sensing may be expected to providedegraded performance.

In some aspects, small scale sensing includes listening/sensing acommunication channel before transmission, and access the channel if thesidelink resource satisfies channel access criteria or, in thealternative, perform random back-off. The small scale sensing can bedone based on additional short-term/small-scale power measurements(e.g., RSSI or RSRP) or control channel processing. The support of smallscale sensing requires considerations regarding the sidelink resourcegrid and channel access occasions. In particular, the sidelink resourcegrid may be divided into small channel access occasions. The granularityof large and small scale sidelink resources in time and frequency can beconfigurable, where a large scale resource is composed of multiple smallscale resources.

In some embodiments, the following LIE autonomous resource allocationschemes may be used:

Scheme 1: Large scale (long term) sensing based on LTE Rel-14vehicle-to-vehicle (V2V) procedure without RSSI averaging.

Scheme 2: Large scale (long term) sensing based on LTE Rel-14 V2Vprocedure without RSSI averaging and prioritization of the first in timecandidate resource for selection (randomization is applied within Nfirst in time candidate resources).

Scheme 3: Large scale (long term) sensing based on LTE Rel-14 V2V incombination with small scale (short term) sensing procedure. The smallscale sensing procedure may additionally take into account resourcereservations announced within a resource selection window (i.e., madebefore actual transmission of the first TTI). A UE may re-selectcandidate resource(s) if suitable resource(s) are available, otherwisethe UE may perform transmission according to the latest resourceselection decision.

Scheme 4: Large scale (long term) sensing based on LTE Rel-14 V2V incombination with small scale (short term) sensing procedure andadditional short term reservation signaling preceding actualtransmission of each TB. The resource for short term reservationsignaling is determined based on the sensing procedure. In this case,small scale (short term) sensing procedure takes into accounttransmissions within a resource selection window that was made ahead ofshort term reservation signaling transmission. Once the short termreservation signaling is transmitted, a UE does not change resourceselection decision which is announced in short term reservationsignaling.

Scheme 5: Small scale (short term) sensing with small scale (short term)reservations signaling. In the case of aperiodic traffic, only Scheme 5becomes equivalent to Scheme 4.

In some aspects, large scale (long term) sensing forms candidate setonly if some of the UEs indicate long term resource reservation, whichis always the case for periodic traffic. Otherwise, all resources withina resource selection window are considered as candidate resources. Thelatter is valid in case of aperiodic traffic, where there are noresource reservations in the longer term. However, given that each HEuses multiple TTIs for a single TB transmission, it is assumed that thefirst in time transmission reserves resources for remainingretransmissions. In case of periodic traffic, the small scalereservation signaling may be transmitted only during long-term resourcereselection. For aperiodic traffic, the small scale reservationsignaling may be transmitted for each transmitted TB.

Intelligent UE Processing Behaviors/Capabilities.

In LTE, a UE may have a limited sidelink PSCCH/PSSCH channel decodingcapability that leads to the UE behavior when the UE attempts to decodeonly the strongest sidelink transmitter on a given PSCCH resource. SuchUE behavior is suboptimal and further enhancements may be used asdiscussed hereinbelow.

In terms of PSSCH decoding, in each slot, the UE may select the “best”candidates for PSSCH decoding among all detected sidelink transmissionswhich are completed in a given slot and may use capacity or mutualinformation or any other metric characterizing probability of successfuldecoding of a given PSSCH transmission to select candidates for PSSCHdecoding. This metric can be obtained based on SL-RSRP and SL-RSRQmeasurements using PSSCH demodulation reference signals (DM-RSs). The UEis expected to attempt to decode PSSCHs until it reaches its PSSCHprocessing capability limit. The LIE may also prioritize PSSCH decodingbased on QoS attributes (e.g., priority, reliability, and communicationrange/distance) conveyed in successfully decoded PSCCHs.

In terms of PSCCH decoding, for each slot, a UE may attempt to detectPSCCH transmissions on all PSCCH resources within the slot and canperform multiple decoding attempts per resource unless it reaches itsPSCCH decoding capability limit. The UE can first detect PSCCHtransmissions on each resource based on PSCCH DMRS SL-RSRP/SL-RSRQmeasurements.

In general, the following UE behaviors are possible depending on UEprocessing capabilities/implementation:

UE Behavior 1: Single PSCCH/Single PSSCH. The number of PSCCH and PSSCHdecoding attempts is equal to the number of PSCCH resourcesallocated/configured per slot.

UE Behavior 2: Single PSCCH/Multiple PSSCH. The number of PSCCH decodingattempts is equal to the number of PSCCH resources allocated per slot,and the number of PSSCH decoding attempts exceeds the number of PSCCHresources per slot.

UE Behavior 3: Multiple PSCCH/Single PSSCH. The number of PSCCH decodingattempts exceeds the number of PSCCH resources allocated per slot, andthe number of PSSCH decoding attempts is equal to the number of PSCCHresources per slot.

UE Behavior 4: Multiple PSCCH/Multiple PSSCH. The number of PSCCHdecoding attempts exceeds the number of allocated PSCCH resources perslot, and the number of PSSCH decoding attempts exceeds the number ofPSCCH resources per slot.

FIG. 3A illustrates a transmission resource occupancy map 300, inaccordance with some aspects. Referring to FIG. 3, the occupancy map 300illustrates transmissions multiplexing of transmissions TX1, TX2, TX3,and TX4 in time-frequency resources. The received PSSCH power (or othermetric) for the transmissions can be Ptx1>Ptx2>Ptx3>Ptx4.

FIG. 3B illustrates decoding capability impact and UE processingbehaviors 302B-308B, in accordance with some aspects. Referring to FIG.3B, UE processing behavior 302B (e.g., UE Behavior 1 described above) isassociated with one PSCCH decoding and one PSSCH decoding. UE processingbehavior 304B (e.g., UE Behavior 2 described above) is associated withone PSCCH decoding and multiple (e.g., M) PSSCH decoding attempts. UEprocessing behavior 306B (e.g., UE Behavior 3 described above) isassociated with multiple (e.g., M) PSCCH decoding attempts and one PSSCHdecoding. UE processing behavior 308B (e.g., UE Behavior 4 describedabove) is associated with multiple (e.g., M) PSCCH decoding attempts andmultiple (e.g., N) PSSCH decoding attempts.

In some aspects, the following scenarios can be applicable when only twoPSCCH resources are allocated within each slot. In terms of PSSCHdecoding, the UE may perform either two or four PSSCH decoding attemptsper slot. In summary, the following UE processing capabilities can beconfigured:

Case 1: Two PSCCH decoding per slot and two PSSCH decoding per slot;Case 2: Two PSCCH decoding per slot and four PSSCH decoding per slot;Case 3: Four PSCCH decoding per slot and two PSSCH decoding per slot;and Case 4: Four PSCCH decoding per slot and four PSSCH decoding perslot.

In some aspects, multiple PSCCH and PSSCH decoding attempts cansignificantly improve the performance of the NR-V2X sidelinkcommunication and significantly improve system reliability.

FIG. 4 illustrates a block diagram of a communication device such as anevolved Node-B (eNB), a next generation Node-B (gNB), an access point(AP), a wireless station (STA), a mobile station (MS), or a userequipment (UE), in accordance with some aspects and to perform one ormore of the techniques disclosed herein. In alternative aspects, thecommunication device 400 may operate as a standalone device or may beconnected (e.g., networked) to other communication devices.

Circuitry (e.g., processing circuitry) is a collection of circuitsimplemented in tangible entities of the device 400 that include hardware(e.g., simple circuits, gates, logic, etc.). Circuitry membership may beflexible over time. Circuitries include members that may, alone or incombination, perform specified operations when operating. In an example,the hardware of the circuitry may be immutably designed to catty out aspecific operation (e.g., hardwired). In an example, the hardware of thecircuitry may include variably connected physical components (e.g.,execution units, transistors, simple circuits, etc.) including amachine-readable medium physically modified (e.g., magnetically,electrically, moveable placement of invariant massed particles, etc.) toencode instructions of the specific operation.

In connecting the physical components, the underlying electricalproperties of a hardware constituent are changed, for example, from aninsulator to a conductor or vice versa. The instructions enable embeddedhardware (e.g., the execution units or a loading mechanism) to createmembers of the circuitry in hardware via the variable connections tocarry out portions of the specific operation when in operation.Accordingly, in an example, the machine-readable medium elements arepart of the circuitry or are communicatively coupled to the othercomponents of the circuitry when the device is operating. For example,any of the physical components may be used in more than one member ofmore than one circuitry. For example, under operation, execution unitsmay be used in a first circuit of a first circuitry at one point in timeand reused by a second circuit in the first circuitry, or by a thirdcircuit in a second circuitry at a different time. Additional examplesof these components with respect to the device 400 follow.

In some aspects, the device 400 may operate as a standalone device ormay be connected (e.g., networked) to other devices. In a networkeddeployment, the communication device 400 may operate in the capacity ofa server communication device, a client communication device, or both inserver-client network environments. In an example, the communicationdevice 400 may act as a peer communication device in peer-to-peer (P2P)(or other distributed) network environment. The communication device 400may be a LT, eNB, PC, a tablet PC, a STB, a PDA, a mobile telephone, asmartphone, a web appliance, a network router, switch or bridge, or anycommunication device capable of executing instructions (sequential orotherwise) that specify actions to be taken by that communicationdevice. Further, while only a single communication device isillustrated, the term “communication device” shall also be taken toinclude any collection of communication devices that individually orjointly execute a set (or multiple sets) of instructions to perform anyone or more of the methodologies discussed herein, such as cloudcomputing, software as a service (SaaS), and other computer clusterconfigurations.

Examples, as described herein, may include, or may operate on, logic ora number of components, modules, or mechanisms. Modules are tangibleentities (e.g., hardware) capable of performing specified operations andmay be configured or arranged in a certain manner. In an example,circuits may be arranged (e.g., internally or with respect to externalentities such as other circuits) in a specified manner as a module. Inan example, the whole or part of one or more computer systems (e.g., astandalone, client or server computer system) or one or more hardwareprocessors may be configured by firmware or software (e.g.,instructions, an application portion, or an application) as a modulethat operates to perform specified operations. For example, the softwaremay reside on a communication device-readable medium. In an example, thesoftware, when executed by the underlying hardware of the module, causesthe hardware to perform the specified operations.

Accordingly, the term “module” is understood to encompass a tangibleentity, be that an entity that is physically constructed, specificallyconfigured (e.g., hardwired), or temporarily (e.g., transitorily)configured (e.g., programmed) to operate in a specified manner or toperform part or all of any operation described herein. Consideringexamples in which modules are temporarily configured, each of themodules need not be instantiated at any one moment in time. For example,where the modules comprise a general-purpose hardware processorconfigured using the software, the general-purpose hardware processormay be configured as respective different modules at different times.The software may accordingly configure a hardware processor, forexample, to constitute a particular module at one instance of time andto constitute a different module at a different instance of time.

Communication device (e.g., UE) 400 may include a hardware processor 402(e.g., a central processing unit (CPU), a graphics processing unit(GPU), a hardware processor core, or any combination thereof), a mainmemory 404, a static memory 406, and mass storage 407 (e.g., hard drive,tape drive, flash storage, or other block or storage devices), some orall of which may communicate with each other via an interlink (e.g.,bus) 408.

The communication device 400 may further include a display device 410,an alphanumeric input device 412 (e.g., a keyboard), and a userinterface (UI) navigation device 414 (e.g., a mouse). In an example, thedisplay device 410, input device 412 and UI navigation device 414 may bea touchscreen display. The communication device 400 may additionallyinclude a signal generation device 418 (e.g., a speaker), a networkinterface device 420, and one or more sensors 421, such as a globalpositioning system (GPS) sensor, compass, accelerometer, or anothersensor. The communication device 400 may include an output controller428, such as a serial (e.g., universal serial bus (USB), parallel, orother wired or wireless (e.g., infrared (IR), near field communication(NFC), etc.) connection to communicate or control one or more peripheraldevices (e.g., a printer, card reader, etc.).

The storage device 407 may include a communication device-readablemedium 422, on which is stored one or more sets of data structures orinstructions 424 (e.g., software) embodying or utilized by any one ormore of the techniques or functions described herein. In some aspects,registers of the processor 402, the main memory 404, the static memory406, and/or the mass storage 407 may be, or include (completely or atleast partially), the device-readable medium 422, on which is stored theone or more sets of data structures or instructions 424, embodying orutilized by any one or more of the techniques or functions describedherein. In an example, one or any combination of the hardware processor402, the main memory 404, the static memory 406, or the mass storage 416may constitute the device-readable medium 422.

As used herein, the term “device-readable medium” is interchangeablewith “computer-readable medium” or “machine-readable medium”. While thecommunication device-readable medium 422 is illustrated as a singlemedium, the term “communication device-readable medium” may include asingle medium or multiple media (e.g., a centralized or distributeddatabase, and/or associated caches and servers) configured to store theone or more instructions 424. The term “communication device-readablemedium” is inclusive of the terms “machine-readable medium” or“computer-readable medium”, and may include any medium that is capableof storing, encoding, or carrying instructions (e.g., instructions 424)for execution by the communication device 400 and that cause thecommunication device 400 to perform any one or more of the techniques ofthe present disclosure, or that is capable of storing, encoding orcarrying data structures used by or associated with such instructions.Non-limiting communication device-readable medium examples may includesolid-state memories and optical and magnetic media. Specific examplesof communication device-readable media may include: non-volatile memory,such as semiconductor memory devices (e.g., Electrically ProgrammableRead-Only Memory (EPROM), Electrically Erasable Programmable Read-OnlyMemory (EEPROM)) and flash memory devices; magnetic disks, such asinternal hard disks and removable disks; magneto-optical disks; RandomAccess Memory (RAM); and CD-ROM and DVD-ROM disks. In some examples,communication device-readable media may include non-transitorycommunication device-readable media. In some examples, communicationdevice-readable media may include communication device-readable mediathat is not a transitory propagating signal.

The instructions 424 may further be transmitted or received over acommunications network 426 using a transmission medium via the networkinterface device 420 utilizing any one of a number of transferprotocols. In an example, the network interface device 420 may includeone or more physical jacks (e.g., Ethernet, coaxial, or phone jacks) orone or more antennas to connect to the communications network 426. In anexample, the network interface device 420 may include a plurality ofantennas to wirelessly communicate using at least one ofsingle-input-multiple-output (SIMO), MIMO, ormultiple-input-single-output (MISO) techniques. In some examples, thenetwork interface device 420 may wirelessly communicate using MultipleUser MIMO techniques.

The term “transmission medium” shall be taken to include any intangiblemedium that is capable of storing, encoding or carrying instructions forexecution by the communication device 400, and includes digital oranalog communications signals or another intangible medium to facilitatecommunication of such software. In this regard, a transmission medium inthe context of this disclosure is a device-readable medium.

Although an aspect has been described with reference to specificexemplary aspects, it will be evident that various modifications andchanges may be made to these aspects without departing from the broaderscope of the present disclosure. Accordingly, the specification anddrawings are to be regarded in an illustrative rather than a restrictivesense. This Detailed Description, therefore, is not to be taken in alimiting sense, and the scope of various aspects is defined only by theappended claims, along with the full range of equivalents to which suchclaims are entitled.

1.-20. (canceled)
 21. An apparatus, comprising: a memory; and processingcircuitry in communication with the memory, wherein, to configure a userequipment (UE) for vehicle-to-everything (V2X) sidelink communication,the processing circuitry is configured to: determine a set of candidateresources of the UE from a sidelink resource pool, wherein the sidelinkresource is divided into multiple time slots, frequency channels, andfrequency sub-channels; encode sidelink control information (SCI) fortransmission to a second UE via a physical sidelink control channel(PSCCH), wherein the SCI indicates a plurality of transmission resourcesof the set of candidate resources; map a transport block across theplurality of transmission resources; and encode a physical sidelinkshared channel (PSSCH) for transmission to the second UE using theplurality of transmission resources, wherein the PSSCH is encoded toinclude the mapped transport block.
 22. The apparatus of claim 21,wherein the plurality of transmission resources includes N number of thetime slots, the frequency channels, or the frequency sub-channels, andwherein N is an integer and N>2.
 23. The apparatus of claim 21, whereinthe set of candidate resources is determined during a resource selectionwindow, wherein the resource selection window is configurable, andwherein the resource selection window is determined based on packetdelay budget information.
 24. The apparatus of claim 21, wherein theprocessing circuitry is further configured to: cause discontinuoustransmission in time of the mapped transport block, wherein thediscontinuous transmission includes N number of transmission resourcesof the plurality of transmission resources, wherein N is an integergreater than or equal to 2, and wherein channel access boundaries forthe PSSCH are aligned at a slot level.
 25. The apparatus of claim 21,wherein the processing circuitry is further configured to: select theplurality of transmission resources from the set of candidate resources,based on earliest in time resources after the transport block becomesavailable for transmission.
 26. The apparatus of claim 21, wherein theprocessing circuitry is further configured to: detect a PSCCHtransmission from the second UE prior to the transmission of the mappedtransport block, wherein the detected PSCCH transmission indicatescandidate resources of the second UE for subsequent PSSCH transmissions;and revise the set of candidate resources of the UE based on avoidingcollision with the candidate resources of the second UE.
 27. Theapparatus of claim 21, wherein the processing circuitry is furtherconfigured to: perform channel quality measurements within a sensingwindow to determine the sidelink resource pool.
 28. The apparatus ofclaim 27, wherein the sensing window is configurable based on at least amaximum reservation interval associated with the V2X sidelinkcommunication.
 29. The apparatus of claim 21, wherein the processingcircuitry is further configured to: perform small scale sensing bymonitoring the plurality of transmission resources prior to transmissionof the mapped transport block.
 30. The apparatus of claim 29, whereinthe processing circuitry is further configured to: detect a signal onone of the plurality of transmission resources during the small scalesensing; perform signal measurements on the detected signal; anddetermine to proceed with the transmission of the mapped transport blockor perform random back-off based on the signal measurements.
 31. Theapparatus of claim 29, wherein the processing circuitry is furtherconfigured to: determine to proceed with the transmission of the mappedtransport block or perform random back-off based on detecting a resourcereservation during the small scale sensing.
 32. The apparatus of claim21, wherein the processing circuitry is further configured to: decodePSCCH data and PSSCH data from the second UE, wherein a number ofdecoding attempts for the PSCCH data is equal to the number of decodingattempts for the PSSCH data.
 33. The apparatus of claim 21, furthercomprising transceiver circuitry coupled to the processing circuitry;and one or more antennas coupled to the transceiver circuitry.
 34. Anon-transitory computer-readable storage medium that stores instructionsfor execution by one or more processors of a user equipment (UE), theinstructions to configure the UE for New Radio (NR)vehicle-to-everything (V2X) sidelink communication, and to cause the UEto: determine during a resource selection window, a set of candidateresources of the UE from a sidelink resource pool, wherein the sidelinkresource is divided into multiple time slots, frequency channels, andfrequency sub-channels; select a plurality of transmission resourcesfrom the set of candidate resources, based on earliest in time resourcesafter a transport block becomes available for transmission to a secondUE; encode sidelink control information (SCI) for transmission to thesecond UE via a physical sidelink control channel (PSCCH), wherein theSCI indicates the plurality of transmission resources of the set ofcandidate resources; map the transport block across the plurality oftransmission resources; and encode a physical sidelink shared channel(PSSCH) for transmission to the second UE using the plurality oftransmission resources, the PSSCH encoded to include the mappedtransport block.
 35. The non-transitory computer-readable storage mediumof claim 34, wherein the instructions further cause the UE to: performsmall scale sensing by monitoring the plurality of transmissionresources prior to transmission of the mapped transport block; anddetermine to proceed with the transmission of the mapped transport blockor perform random back-off based on detecting a resource reservationduring the small scale sensing.
 36. A non-transitory computer-readablestorage medium that stores instructions for execution by one or moreprocessors of a user equipment (UE), the instructions to configure theUE for New Radio (NR) vehicle-to-everything (V2X) sidelinkcommunication, and to cause the UE to: determine a set of candidateresources of the UE from a sidelink resource pool, wherein the sidelinkresource is divided into multiple time slots, frequency channels, andfrequency sub-channels; encode sidelink control information (SCI) fortransmission to a second UE via a physical sidelink control channel(PSCCH), wherein the SCI indicate a plurality of transmission resourcesof the set of candidate resources; map a transport block across theplurality of transmission resources; and encode a physical sidelinkshared channel (PSSCH) for transmission to the second UE using theplurality of transmission resources, wherein the PSSCH is encoded toinclude the mapped transport block.
 37. The non-transitorycomputer-readable storage medium of claim 36, wherein the instructionsfurther cause the UE to: cause discontinuous transmission in time of themapped transport block, wherein the discontinuous transmission includesN number of transmission resources of the plurality of transmissionresources, wherein N is an integer greater than or equal to 2, andwherein channel access boundaries for the PSSCH are aligned at a slotlevel.
 38. The non-transitory computer-readable storage medium of claim36, wherein the instructions further cause the UE to: detect a PSCCHtransmission from the second UE prior to the transmission of the mappedtransport block, wherein the detected PSCCH transmission indicatescandidate resources of the second UE for subsequent PSSCH transmissions;and revise the set of candidate resources of the UE based on avoidingcollision with the candidate resources of the second UE.
 39. Thenon-transitory computer-readable storage medium of claim 36, wherein theinstructions further cause the UE to: perform small scale sensing bymonitoring the plurality of transmission resources prior to transmissionof the mapped transport block.
 40. The non-transitory computer-readablestorage medium of claim 39, wherein the instructions further cause theUE to: detect a signal on one of the plurality of transmission resourcesduring the small scale sensing; perform signal measurements on thedetected signal; and determine to proceed with the transmission of themapped transport block or perform random back-off based on the signalmeasurements.